Bought in 1950 for "25,000 pounds sterling, the equivalent then of $70,093"[0] and sold in 1989 for "over $5 million"[1].

[0] https://lithub.com/the-quest-to-acquire-the-oldest-most-expe...

[1] https://librarianofbabel.wordpress.com/2014/12/01/estelle-do...